# try:
#     try:
#         num = int(input("请输入数字:"))
#         rustle = 1/num
#         print(rustle)
#     except ValueError as a:
#         print("请输入数字")
#         print(a)
#
# except ZeroDivisionError as b:
#     print("不能输入0")
#     print(b)


def fn1():
    result = 1/0

def fn2():
    fn1()

def fn3():
    try:
        fn2()
    except ZeroDivisionError as a:
        print("除数不能是0")
        print(a)
fn3()


